ISSN:
1573-8779
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract This is the first x-ray diffraction structural analysis of a dicoordinated phosphorus derivative with an N=P−O group, namely, the 2,6-di-tert-butylmethylphenyl ester of N-[2,4,6-tri(tert-butyl)phenyl]phosphenimidous acid (I) using λMo radiation and 6552 reflections to R=0.045. The unit cell parameters of the triclinic crystals are as follows: a=9.297, b=12.004, c=15.031, α=107.87, β=101.50, γ=95.50°, V=1542 Å3, d calc =1.1 g/cm3, Z=2, space group P $$\bar 1$$ . The bond angle at the dicoordinated phosphorus atom is 110.3° and the PNC angle is 173.7°. The change in the hybridization of the nitrogen atom in I toward sp and the enhancement of the n N ,σ P−O * interaction lead to shortening of the P=N and N−C bonds to 1.500 and 1.395 Å and elongation of the P−O bond to 1.658 Å. The steric strain in I leads to nonplanarity of the central group. The CNOP torsion angle is 86.3°, while the NPOC torsion angle is 169.2°.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00752796
Permalink